E.g.f.: -log(1 - log(1 + x) * exp(x)).

Terms

a(0) =0a(1) =1a(2) =2a(3) =7a(4) =29a(5) =183a(6) =1319a(7) =12122a(8) =124802a(9) =1508581a(10) =20150509a(11) =302637564a(12) =4960500764a(13) =89164162579